The spelling of "Loisa" can be analysed through IPA phonetic transcription. The initial sound "l" is pronounced as /l/, followed by the vowel sound "oi" which is represented as /ɔɪ/. The last two sounds are "s" and "a", which are transcribed respectively as /s/ and /ə/. Therefore, the phonetic transcription of the word "Loisa" is /lɔɪsə/. It is important to understand the phonetic representation of words in order to improve one's pronunciation and spelling.